In this sequel to What Katy Did, Katy Carrhas recovered from her long period ofparalysis, and is sent, along with hersister Clover, to Hillsover boarding school.The girls fall into friendship with themischievous Rose Red, and the three ofthem start a secret club and get intotrouble with their teachers. During hertime at Hillsover, Katy has a positiveinfluence on the younger girls at theschool, while they help her to regainsome of her youthfulness, lost as a resultof her illness.